Import mailboxes In the Mail app on your Mac, choose File > Import Mailboxes. Select a source in the list, read the information that appears below the list, then click Continue. … Reorganize the imported messages, if you like.

If you can’t send emails in Mail on Mac Make sure the outgoing (SMTP) mail server is specified as directed by the provider of your email account. See Verify an email account’s outgoing server. Choose Window > Connection Doctor, then follow the instructions displayed in the Details column.